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Historic Oregon Engineering Record Page 1 of 47 Prospect Diversion Project Historic Oregon Engineering Record Page 1 of 47 HISTORIC OREGON ENGINEERING RECORD PROSPECT DIVERSION PROJECT JACKSON COUNTY, OREGON Names: Prospect Nos. 1, 2, and 4 Hydroelectric Project (Federal Energy Regulatory Commission [FERC] Project No. 2630) Historically, the Prospect Diversion Project (California Oregon Power Company [COPCO] Project No. 2001) Location: Approximately 45 miles northeast of Medford, Oregon, near the town of Prospect, Jackson County, Oregon. Middle Fork Diversion Dam: Township 33S, Range 3E, Section 1, NENE GPS: 42°44’8.55”N, 122°24’6.03”W (center of dam) Middle Fork Warming Shed: Township 33S, Range 3E, Section 1, NENE GPS: 42°44’8.74”N, 122°24’6.038”W Middle Fork Gauge Shelter: Township 33S, Range 3E, Section 1, NENE GPS: 42°44’7.58”N, 122°24.6.33”W Red Blanket Diversion Dam: Township 32S, Range 3E, Section 27, SESE GPS: 42°45’9.52”N, 122°26’37.95”W (center of dam) Red Blanket Canal Intake: Township 32S, Range 3E, Section 27, SWSE GPS: 42°45’14.82”N, 122°26’49.07”W Red Blanket Gauge Shelter: Township 32S, Range 3E, Section 27, SESW GPS: 42°45’8.41”N, 122°27’1.16”W Barr Creek Gauge Shelter: Township 32S, Range 3E, Section 28, SESW GPS: 42°45’6.80”N, 122°28’14.64”W North Fork Diversion Dam: Township 32S, Range 3E, Section 29, NWSW GPS: 42°45’22.90”N, 122°29’53.42”W (center of dam) Prospect Diversion Project (including canals, pipelines, and siphons): Township 33S, Range 3E, Sections 1, 2, and 3; Township 32S, Range 3E, Sections 28, 29, 33, and 34 Construction Date: 1931 Engineers: Byllesby Engineering & Management Corporation Prospect Diversion Project Historic Oregon Engineering Record Page 2 of 47 Builder: California Oregon Power Company Present Owner: PacifiCorp (formerly Pacific Power & Light) Historic Use: Hydroelectric power facility Present Use: Hydroelectric power facility Significance: Prospect Nos. 1, 2, and 4 Hydroelectric Project meets the National Register of Historic Places (NRHP) eligibility criteria as a historic district under Criterion A, for associations with events that made a significant contribution to the broad patterns of local history, specifically hydroelectric power production and development in the Rogue River Valley. Though no formal NRHP nomination has been completed, preliminary evaluation of the Prospect Nos. 1, 2, and 4 Project indicates a period of significance extending from 1911 to 1933.1 The presumed Prospect Hydroelectric System historic district includes the linear water conveyance system, diversion dams, powerhouses, and auxiliary residential and administrative buildings of Prospect Nos. 1, 2, and 4. The Prospect Diversion Project, completed in 1931, is a component of the overall Prospect Nos. 1, 2, and 4 Project, and includes the Middle Fork and Red Blanket dams and associated flumes, canals siphons and gauge shelters. Report Prepared Natalie K. Perrin, MS, Architectural Historian by: Heather Lee Miller, PhD, Historian Historical Research Associates, Inc. 909 N. Beech Street, Suite 210 Portland, OR 97227 Photographer: Natalie K. Perrin Report Date: October 2010 1 PacifiCorp, “Historic Resource Inventory & Assessment Report: Prospect Nos. 1, 2, and 4 Hydroelectric Project Relicensing, FERC Project No. 2630,” 2003, PacifiCorp Headquarters, Portland, Oregon. Prospect Diversion Project Historic Oregon Engineering Record Page 3 of 47 I. Introduction Prospect Nos. 1, 2, and 4 Hydroelectric Project (Project) is located in Jackson County, Oregon, on the Rogue River and two tributary streams approximately 45 miles northeast of Medford, Oregon, near the town of Prospect. The Project consists of three concrete diversion dams located on the Middle Fork Rogue River (Middle Fork dam), Red Blanket Creek (Red Blanket dam), and the Rogue River (North Fork dam). The dams divert water through approximately 9.25 miles of water conveyance system to a forebay. The forebay supplies water to three powerhouses, with a total capacity of approximately 36.75 megawatts (mW) (3.75 mW from Prospect No. 1 powerhouse, 32 mW from Prospect No. 2 powerhouse, and 1 mW from Prospect No. 4 powerhouse). In 1995, the Oregon State Historic Preservation Office (SHPO) determined that Prospect project facilities appeared to meet the eligibility criteria for listing in the National Register of Historic Places (NRHP).2 No formal determination of the project’s NRHP eligibility has been completed, nor have district boundaries or identification of contributing and noncontributing resources been determined aside from inventory conducted as part of the relicensing process and drafting of the Project’s Historic Properties Management Plan (HPMP).3 Based upon a historic context and site history prepared by Historical Research Associates, Inc. (HRA), Prospect Nos. 1 and 2 meet NRHP eligibility criteria as a historic district under Criterion A, with a period of significance extending from 1911 to 1933.4 As defined in the HPMP, the presumed Prospect Hydroelectric System historic district includes the linear water conveyance system, diversion dams, powerhouses, and auxiliary residential and administrative buildings of Prospect Nos. 1, 2, and 4. The Prospect Diversion Project (California Oregon Power Company [COPCO] Project No. 2001) was constructed in 1931, and included diversion dams constructed on the Middle and South Forks of the Rogue River as well as Red Blanket Creek. Though the South Fork dam, Prospect No. 3 powerhouse and water conveyance system is regulated as Prospect No. 3 (Federal Energy Regulatory Commission [FERC] Project No. 2337), the bulk of the Prospect Diversion Project was absorbed into what is regulated as Prospect Nos. 1, 2, and 4 Hydroelectric Project (FERC Project No. 2630). Ongoing new license implementation plans at the Project will affect resources located within the Prospect Hydroelectric Project historic district. Implementation plans require removal of the Middle Fork, Red Blanket, and Barr Creek gauge shelters, the Middle Fork and North Fork warming sheds, and alterations to the Middle Fork canal headgate and Red Blanket dam. With the exception of the North Fork warming shed, affected project resources were constructed for use during planning of or as part of the Prospect Diversion Project; the North Fork warming shed was built concurrent with the North 2 PacifiCorp, “Historic Properties Management Plan for Prospect Nos. 1, 2, and 4 Hydroelectric Project Relicensing, FERC Project No. 2630,” May 2005, 1, PacifiCorp Headquarters. 3 Ibid.; and PacifiCorp, “Historic Resource Inventory & Assessment Report: Prospect Nos. 1, 2, and 4 Hydroelectric Project Relicensing, FERC Project No. 2630,” 2003, PacifiCorp Headquarters. 4 PacifiCorp, “Historic Resource Inventory & Assessment Report: Prospect Nos. 1, 2, and 4 Hydroelectric Project Relicensing, FERC Project No. 2630,” 2003. Prospect Diversion Project Historic Oregon Engineering Record Page 4 of 47 Fork dam, completed in 1928, and predates other affected project resources. This Historic Oregon Engineering Record (HOER) focuses specifically on the construction of the Prospect Diversion Project.5 This HOER was commissioned by PacifiCorp in consultation with SHPO as mitigation for effects to these resources caused by new license implementation plans.6 II. Historic Context In the 1850s, brothers Dr. Charles R. and Col. Frank H. Ray established the Braden Mine and Mill on Gold Hill, now the town of Gold Hill in Jackson County, Oregon. Encouraged by technological advances in hydroelectric power production7 and frustrated by the cost and limitations of steam power, the Rays incorporated the Condor Water & Power Company and sold bonds to cover the cost of hydroelectric development on the Rogue River.8 By 1902, they had completed construction of a hydroelectric facility at Gold Ray. Production was substantially augmented in 1911 with construction of the Prospect Hydroelectric Plant (now Prospect No. 1 powerhouse) on the Rogue River. The water-conveyance system, powerhouse, and transmission line from Prospect to the Gold Ray plant were completed in 1911. Prospect not only powered the Ray brothers’ milling operation but also provided electricity to the communities of Medford, Jacksonville, Central Point, Grants Pass, and Ashland, Oregon, thereby directly contributing to the region’s early twentieth-century agricultural (orchard) boom.9 In 1912, the California Oregon Power Company, better known as COPCO, purchased the Rays’ interest in the Prospect plant.10 By 1921, preliminary studies were being conducted to increase the capacity of the Prospect Development. In 1926, COPCO initiated construction of a greatly expanded Rogue River hydroelectric system that 5 The South Fork dam, Prospect No. 3 powerhouse, and associated water conveyance features, known collectively as the Prospect No. 3 Hydroelectric Project, were constructed concurrent with the Prospect Diversion Project. However, these resources are regulated under separate license from Prospect Nos. 1, 2, and 4, and will not be affected by ongoing license implementation plans. With the exception of where information is included in developing the historic context for the Prospect Diversion Project, Prospect No. 3 resources are not included in this report. 6 Julie Osborne to Russ Howison, RE: SHPO Case No. 10-1021, Prospect Hydroelectric Project Addendum, Prospect, Jackson County, August 26, 2010, 1. 7 Hydroelectric power development in the Pacific Northwest depended upon significant technological advances, including development of the large capacity hydroturbogenerator (1895);
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